Abstract
The advent of the new active distribution networks with Distributed Energy Resources (DERs) connected to the customer side of the meter guarantees a solution to the ever-increasing power demand. But simultaneously imposes some major confrontation to the previously installed protection system. Two-way power flow, significant changes in magnitude and direction of fault current may lead to non-discriminative, non-selective operation, and failure of the protection system. With multiple power flow directions more directional overcurrent relay (DOCR) needs to be inducted into the existing systems. The paper proposes an effective implementation of a digital Inverse Definite Minimum Time (IDMT) Overcurrent (OC) Relay and its directional counterpart in MATLAB Simulink® environment and discusses a Genetic Algorithm (GA) based relay coordination scheme considering radial topology of the micro-grid in grid-connected mode.
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